Ziro town is situated at the foothills of Himalayas in the state of Arunachal Pradesh in Northeast India (NEI). This town is surrounded by several active faults and thrusts. Several high magnitude earthquake have already occurred in NEI. Among them, the epicenter of the Great Assam Earthquake of Magnitude Mw 8.7 in 1950 and 1897 Earthquake of Mw-8.5 was located around this region. Therefore, based on these past seismic activities, this town is considered to be seismically highly vulnerable. So, it very much necessary to calculate the seismic hazard for the Ziro town. Considering this seismic background, in this paper, seismic hazard analysis at the bedrock level of Ziro town is estimated using deterministic approach. Total of 142 faults have been identified which are centered around 300 km radius with respect to Ziro town. The maximum potential magnitude (Mmax) of each seismogenic source known as faults was calculated using the scaling relation given by Wells and Coppersmith (1994). The response spectra have been prepared for two locations within Ziro town. Peak ground acceleration (PGA) varies from 0.19 g to 0.55 g, and the calculated seismic hazard value at the bedrock level can be further used to estimate the surface level seismic hazard using ground response analysis. The surface level seismic hazard will be directly useful for the designing of various engineering structures in Ziro town and in NEI.

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Seismic Hazard Analysis of Ziro Town Using Deterministic Approach

  • G. Mamung,
  • T. Rahman,
  • T. Taser

摘要

Ziro town is situated at the foothills of Himalayas in the state of Arunachal Pradesh in Northeast India (NEI). This town is surrounded by several active faults and thrusts. Several high magnitude earthquake have already occurred in NEI. Among them, the epicenter of the Great Assam Earthquake of Magnitude Mw 8.7 in 1950 and 1897 Earthquake of Mw-8.5 was located around this region. Therefore, based on these past seismic activities, this town is considered to be seismically highly vulnerable. So, it very much necessary to calculate the seismic hazard for the Ziro town. Considering this seismic background, in this paper, seismic hazard analysis at the bedrock level of Ziro town is estimated using deterministic approach. Total of 142 faults have been identified which are centered around 300 km radius with respect to Ziro town. The maximum potential magnitude (Mmax) of each seismogenic source known as faults was calculated using the scaling relation given by Wells and Coppersmith (1994). The response spectra have been prepared for two locations within Ziro town. Peak ground acceleration (PGA) varies from 0.19 g to 0.55 g, and the calculated seismic hazard value at the bedrock level can be further used to estimate the surface level seismic hazard using ground response analysis. The surface level seismic hazard will be directly useful for the designing of various engineering structures in Ziro town and in NEI.